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placed above the sand pack. The 2-inch-diameter PVC VES wells will extend from the around <br /> surface to 1 to 2 feet below the static groundwater. Screened casing in the soil vapor wells will <br /> extend from the bottom (approximately 13 to 14 bas) to within 5 feet of the top of the casing- <br /> Number 3 sand will be placed above the top of the sparge well bentonite seal to 1 to 2 feet above <br /> the top of the vapor extraction well screen. A 1- to 2-foot-thick layer of bentonite pellets will <br /> be installed on top of the sand. The remaining annular space will be filled with cement/bentonite <br /> grout. Wells VES-3 through VES-5 will be completed within existing traffic rated vaults. Wells <br /> VES-1, VES-2, and VES-7 will be completed within standard traffic boxes. <br /> Dual Completion Groundwater Monitoring/Air Sparge Well Installation <br /> The dual completion groundwater monitoring/air sparge well (SMW-1) will be completed <br /> as illustrated on Figure 4. The borehole for this well will be drilled to a depth of approximately <br /> 30 feet bes. The well will be constructed as presented on Figure 4. The sparge wells will extend <br /> to 30 feet with 2.5 feet of well screen at the bottom. Number 3 Lone Star sand will be installed <br /> adjacent to the sparge well screen and will extend to 2 feet above the top of the screen. A <br /> minimum 3-foot-thick layer of bentonite pellets will be placed above the sand pack. The <br /> groundwater monitoring well will be constructed of 4-inch PVC, schedule 40 casing. Slotted <br /> casing (0.020 inch) will extend from 5 feet to 20 feet below ground surface. Blank casing will <br /> extend from the top of the slotted interval to ground surface. <br /> Number 3 sand will extend from the top of the bentonite layer for the sparge well to 2 <br /> feet above the top of the monitoring well screen. A I- to 2-foot thick Iayer of bentonite pellets <br /> will be placed on top of the sane. A bentonite/cement grout will be placed above the bentonite <br /> to immediately below the top of the casing. <br /> SITE SAFETY AND HEALTH PLAN <br /> Specific health and safety procedures will be followed during the site work as outlined <br /> in a Site Safety and Health Plan (SSHP) as prepared for this site in October 1988. The SSHP <br /> will be updated and approved by BC's corporate health and safety officer prior to commencement <br /> of field activities. <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document. <br /> 7524%REPORTSIWORKPLN <br />